They include carbon stored in vegetation (above and below ground), decaying matter in the soil, and wood products.
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Negotiable credit in the international carbon market originated from clean development mechanism (CDM) projects.
Activities that are part of a candidate CDM project and that provide a reduction in the emission of greenhouse gases or an increase in the removal of CO2. (see question 20 of the ABC of Changes)
Emissions produced as a result of human action. For example, large amounts of carbon dioxide are being released into the atmosphere by activities such as the burning of fossil fuels, agriculture, cement making, and so on.